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about to only mathematics

A

20

B

15

C

22

D

27

Text Solution

Verified by Experts

The correct Answer is:
1
The centers are `(10,0)` and `(-15,0)`
and the radii are `r_(1)=6` and `r_(2)=9`
Also, `d=25,r_(1)+r_(2) lt d`.

So, the circle are neither intersecting nor touching. Therefore,
`PQ= sqrt(d^(2)-(r_(1)+r_(2))^(2))`
`=sqrt(625-225)`
`=20`
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  8. If the angle of intersection of the circle x^2+y^2+x+y=0 and x^2+y^2+x...

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  9. The coordinates of two points Pa n dQ are (x1,y1)a n d(x2,y2)a n dO is...

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  15. The centre of the smallest circle touching the circles x^2+ y^2-2y -3=...

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  16. Two circle with radii r(1) and r(2) respectively touch each other exte...

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  18. The common chord of the circle x^2+y^2+6x+8y-7=0 and a circle passing ...

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